A Constant Temperature Current Source Realized Only by Field Effect Transistor

Abstract

The invention discloses a constant-temperature current source realized simply through field-effect transistors. The constant-temperature current source realized simply through the field-effect transistors comprises a power supply end, a grounding end, a current output end, the first field-effect transistor, the second field-effect transistor, the third field-effect transistor, the fourth field-effect transistor, the fifth field-effect transistor, the sixth field-effect transistor, the seventh field-effect transistor, the eighth field-effect transistor, the ninth field-effect transistor and the tenth field-effect transistor, wherein the first field-effect transistor, the second field-effect transistor, the third field-effect transistor, the fourth field-effect transistor and the fifth field-effect transistor are combined to generate the current source with the temperature compensation function, and the sixth field-effect transistor, the seventh field-effect transistor, the eighth field-effect transistor, the ninth field-effect transistor and the tenth field-effect transistor provide necessary direct-current bias so that the working point of the current source can be guaranteed. According to the constant-temperature current source realized simply through the field-effect transistors, the current source is realized simply through the transistors, resistors and triodes are not adopted, the one-order temperature compensation function is also achieved, the structure is simple, and cost is low.

Description

Technical field [0001] The invention relates to a current source circuit, in particular to a constant temperature current source realized only by a field effect tube. Background technique [0002] The existing current source circuit usually uses a bandgap reference circuit to generate the current source, and the bandgap reference circuit needs to be realized by a combination of a transistor, a resistor, and a field effect tube. Because the area of ​​the transistor and the resistor is large, the current source circuit It has a large area and complex structure, which increases the cost of the chip. At the same time, because the bandgap reference circuit does not perform temperature compensation on the current, the generated current is proportional to the temperature and cannot offset the effect of temperature. [0003] Therefore, it is necessary to provide a current source circuit with a simple structure and temperature compensation. Summary of the invention [0004] The purpose of t...

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Problems solved by technology

[0002] The existing current source circuit usually uses a bandgap reference circuit to generate the current source, and the bandgap reference circuit needs to be realized by a combination of a triode, a resistor, and a field effect tube. Due to the large area of ​​the triode and the resistor, the current source circuit The area is very large and the structure is more complicated, which increases the cost of the chip. At the same time, because the bandgap reference circuit does not perform temperature compensation on the current, the generated current is proportional to the temperature and cannot offset the influence of the temperature.

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